稀土镧催化热解二甲苯制备炭/炭复合材料的导热与摩擦性能  

Thermal conduction and tribological properties of carbon/carbon composites densified by xylene pyrolysis using La as a catalyst

作　　者：邓海亮 郑金煌[3] 殷忠义[3] 姚冬梅[3] 苏红[3] 张晓虎 斯松华[1] DENG Hai-liang;ZHENG Jin-huang;YIN Zhong-yi;YAO Dong-mei;SU Hong;ZHANG Xiao-hu;SI Song-hua(School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Maanshan 243002,China;Xi’an Aerospace Composite Research Institute,Xi’an 710025,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [3]西安航天复合材料研究所,陕西西安710025

出　　处：《新型炭材料》2020年第1期80-86,共7页New Carbon Materials

基　　金：国家自然科学基金(51972002);装备预研基金(9140A12060514HT43190).

摘　　要：采用薄膜沸腾CVI以LaCl3催化热解二甲苯、浸渍树脂及高温处理后获得密度为1.72~1.73 g/cm^3的炭/炭(C/C)复合材料,应用激光热导仪、摩擦试验机及扫描电镜等研究了催化剂含量对材料导热和摩擦性能的影响。结果表明,催化剂含量由0增加至15 wt%时,材料的热导率先升高后降低,摩擦系数及磨损率的变化与之相反。含量6 wt%下材料的导热性能较高,垂直与平行摩擦面方向的热导率最大分别为40.3和86.1 W/(m·K),较含量为0时提高约58.5%和75.6%;制动过程中,摩擦面易于形成纳米丝状碳增强的光滑摩擦膜,是该含量下材料摩擦系数和磨损较低、制动稳定性高的重要原因。Carbon/carbon composites with densities of 1.724.73 g/cm^3 were fabricated by film boiling chemical vapor infiltration of a needle-pierced preform using xylene as a carbon precursor and LaCl3 as a catalyst,followed by resin impregnation and graphitization.The effects of the catalyst content on the thermal conduction and tribological properties of the composites were investigated by SEM,thermal tests with a laser flash instrument,and friction tests.Results showed that the thermal conductivities in the through thickness and in-plane directions,the friction coefficient,and the wear rate all had maxima at 6 wt%for LaCl3 contents from 0 to 15 wt%.The maximum thermal conductivities were about 58.5 and 75.6%higher than those of the composites without a catalyst in the through thickness and in-plane directions,respectively.A smooth friction film was most easily formed on the friction surface of the composite fabricated with a 6 wt%catalyst content,resulting in the lowest coefficient of friction and wear rate as well as the highest braking stability.

关 键 词：C/C复合材料 稀土镧 热导率 摩擦性能 

分 类 号：TB332[一般工业技术—材料科学与工程]